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diving deeper into belt issues


A straight 45?!!! Wow! Never heard of anyone running that! You’d think it would be a Dog down low in the power band !
 
STAIN said:
For what is worth, when I talked to Gilles Gagne he felt that the Sidewinder would have belt problems from the time he saw the cover come off it in Minnesota, and said so to the Yamaha reps.
He felt the angle and length of the secondary ramp was a problem, much as it was on the very first Vmaxx 4. I have been running a straight 45 with the stock spring for the whole season, 2000 miles, with zero problems on his recommendations. Many , many here have opted to go with the stock helix or an even shallower dual angle helix. Why? Is it because it is the cheaper, easier option? I am not sure, I can only post my results with what I am running.
Click to expand...


Have you tried 45 Degrees with a big tune? I have major belt slippage when trying to get up there on the helix on the big tunes. When you can smell belt, its slipping too hard. I may have to try this with an increase in driven spring pressure next season, I've got my hand on some stiffer side pressure driven springs, but stiffer driven springs generally lead to less track power, we'll have to see I guess, maybe it needs something like that.

I find that on 240 the belt can last which is the about same at PT, but on the big tunes 300-400 miles on the belt is the norm, unless one goes easy on the throttle, and at that point one may as well be on a bone stocker, stock muffler, or 240 tune and not worry about belts at that point.

I'll be trying lots more stuff next winter with hopes of getting a better handle on it. Same old stuff the guys were going thru on the old belt blowing 1100. This eating up drive clutch rollers and belts is getting old fast for lots of us.
 
I have tried 45 degree helix with 225hp. Worked great. Stock springs primary and secondary. G-force magnetic primary weights with 16mm roller. Upshifts very quickly but does not bog or slip. I gained 2 MPG. He recommended a 47 degree helix for 13psi of boost.
Like you said, run just enough secondary spring pressure to hold the belt--no more. Its about efficiency. Match the shift rate in both clutches. I am not telling you anything you don't already know.......
Remember, he runs a stock Apex secondary on his Bonneville sled---400 plus hp
 
I noticed Yamaha mentioned a new helix for the '19 SRX, wonder what it is?
 
Here's my 6 cents that are only worth 2 cents after CT taxes get me.
Like KNAPP says, what good is running a tune then driving like a wuss. (paraphrasing obviously) So why would i buy even a stock 200hp sled & drive like a wuss?
There are multiple issues here & i think a lot are different cases.
My buds' exact set up runs 20 degrees cooler. I can vent it or even pay a rat to piss liquid nitrogen on my belt, but it shows mine is less efficient PERIOD!

Here's what i think i know so far worth about -$.01 now:

1. C to C is different making fixing & tuning difficult. Seems like 265ish is where most are doing better
2. Offsets are different & some of us have to have clutch machined just to get close
3. Belt is not designed for this kind of OOMPH! PERIOD!
4. Stub shaft issues. WTF is with that?
5. Are we parallel? Are we supposed to be? i:e is motor torquing? If it torques, should it torque to parallel like my old ZRT 800?
6. Venting. The CAI seems to make matters worse. Can't hurt to vent better
7. Proper helix & springs. Stock springs & all rollers had issues. New helix & spring this year. We'll see if it does anything....or nuthin'
7. If you break your suspension so you can't ride, you can't blow a belt. I haven't blown a belt in over a month!
8. #7 was complete sarcasm! Disappointed sarcasm at that...to be continued
 
I will add two vents for next year,one in front lower left shock tower area,one in front side panel,it wont hurt,but still may not solve all problems.
 
I have try Gforce setup 45* whit 16mm roller. It miss a lot of "snap" down low but good for fuel millage and general trail riding whit high HP tune. No slippage but trail conditions were really good, maybe in deep snow or whit a very agressive track it will. I am actually testing some new improve product for M Gforce :)
45/41 is good but my favorite one is still 41/37 . I'll try a straight 39 or 40 next year.
I have some MAJOR primary roller problems and the size of them(14.5/14.8/15,5/15,8/16mm)affect a lot the CAM it should run.

All the belt i have blown was at full throttle, let off and go back wot and boooom....
running XS825 (2 this year) and a lot of abuse...lol
 
Byam said:
I have try Gforce setup 45* whit 16mm roller. It miss a lot of "snap" down low but good for fuel millage and general trail riding whit high HP tune. No slippage but trail conditions were really good, maybe in deep snow or whit a very agressive track it will. I am actually testing some new improve product for M Gforce :)
45/41 is good but my favorite one is still 41/37 . I'll try a straight 39 or 40 next year.
I have some MAJOR primary roller problems and the size of them(14.5/14.8/15,5/15,8/16mm)affect a lot the CAM it should run.

All the belt i have blown was at full throttle, let off and go back wot and boooom....
running XS825 (2 this year) and a lot of abuse...lol
Click to expand...
My last ride I went back to my original ulmer set up,straight 38 w/red at 10 degrees,primary stm 76 grms w/pibk spring,400 miles on it,ran great,but rpms on a hard dig,will go 9000 than drop to 8600 but IATs were 80 degrees.But was snappy and corner to corner was sick.
 
Has anyone tried dropping helix angle running a bit stiffer front spring and weighting it up right lower angle will grip belt in secondary way better shtiffer front spring weighted right should stop primary from slipping have talked to a lot of sidewinder owners and they are all having belt issues our dealer is saying live with it which is so wrong but it is an issue
 
That’s Yamaha’s new PR slogan these days
Give me 16 grand and DEAL WITH IT.
 
KnappAttack said:
Have you tried 45 Degrees with a big tune? I have major belt slippage when trying to get up there on the helix on the big tunes. When you can smell belt, its slipping too hard. I may have to try this with an increase in driven spring pressure next season, I've got my hand on some stiffer side pressure driven springs, but stiffer driven springs generally lead to less track power, we'll have to see I guess, maybe it needs something like that.

I find that on 240 the belt can last which is the about same at PT, but on the big tunes 300-400 miles on the belt is the norm, unless one goes easy on the throttle, and at that point one may as well be on a bone stocker, stock muffler, or 240 tune and not worry about belts at that point.

I'll be trying lots more stuff next winter with hopes of getting a better handle on it. Same old stuff the guys were going thru on the old belt blowing 1100. This eating up drive clutch rollers and belts is getting old fast for lots of us.
Click to expand...
Mike ,try the BRP vents #860200684 to get some cool air in at the belt .Work good ,look good .
 
Byam said:
I have try Gforce setup 45* whit 16mm roller. It miss a lot of "snap" down low but good for fuel millage and general trail riding whit high HP tune. No slippage but trail conditions were really good, maybe in deep snow or whit a very agressive track it will. I am actually testing some new improve product for M Gforce :)
45/41 is good but my favorite one is still 41/37 . I'll try a straight 39 or 40 next year.
I have some MAJOR primary roller problems and the size of them(14.5/14.8/15,5/15,8/16mm)affect a lot the CAM it should run.

All the belt i have blown was at full throttle, let off and go back wot and boooom....
running XS825 (2 this year) and a lot of abuse...lol
Click to expand...

which roller best so far for performance and durability....I think 15.5 is the happy medium...what is profile of g force weight you ran ...flat?
 
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